The Easter Lesson #46 for Primary 3 should have been scheduled on March 31. So the lesson schedule is wrong from March 31 to Dec 15th. Can you fix it so I can reprint a corrected lesson schedule? Thanks!

This is much easier since the "Insert Lessons" functionality in the latest release. For this particular scenario you should be able to go to the week that the Easter lesson is taught and edit that week to be a custom topic, or no class (just something other than a manual lesson). Do the same for Christmas, and any other weeks that may not be a normal sequential lesson. On weeks where events are already scheduled (like GC or Stake Conference) you don't need to change the lesson type. After you've specified all the "exceptions", click on the "Insert Missing Lessons" link that should show at the top of the page. Leave the "Insert All" radio button checked and click insert. This will reassign all chapters from your manual to weeks that are set to use a manual (essentially reflowing around the Easter & Christmas weeks, and any conferences or other events). Once you've done this then go back and edit the Easter week lesson, change it back to a manual lesson, and select the Easter lesson.